This Schedule 13G is being jointly filed by Poplar
Point Capital Management LLC, a Delaware limited liability company (“PPCM”), Poplar Point Capital Partners
LP, a Delaware limited partnership (“PPCP”), Poplar Point Capital GP LLC, a Delaware limited liability company
(“PPCGP”), and Jad Fakhry, a United States citizen (collectively with PPCM, PPCP and PPCGP, the “Reporting
Persons”) with respect to shares of Common Stock of the Issuer owned by PPCP.

PPCM
is the investment manager for PPCP. PPCGP is the general partner of PPCP. Mr. Fakhry is the manager of, and owns a controlling
interest in, PPCM and PPCGP.

The filing
of this statement shall not be construed as an admission that any of the Reporting Persons is the beneficial owner of any securities
covered by the statement other than the securities actually owned by such person (if any).

(b)

The principal business address for each of the Reporting
Persons is c/o Poplar Point Capital Management LLC, 840 Hinckley Road, Suite 250, Burlingame, CA 94010.

(c)

PPCM, PPCP and PPCGP are all organized in the State
of Delaware. Mr. Fakhry is a United States citizen.

(d)

Title of Class of Securities: Common Stock, par value
$.01 per share.

(e)

CUSIP Number: 293904108.

Item 3.

If This Statement is Filed Pursuant to §§
240.13d-1(b), or 240.13d-2(b) or (c), Check Whether the Person Filing is a:

(a)

¨

Broker or dealer registered under Section 15 of the Act (15 U.S.C. 78o);

(b)

¨

Bank as defined, in Section 3(a)(6) of the Act (15 U.S.C. 78c);

(c)

¨

Insurance company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c);

(d)

¨

Investment company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);

(e)

x

An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);

(f)

¨

An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);

(g)

¨

A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act (15 U.S.C. 80a-3);

(j)

¨

A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J);

(k)

¨

Group, in accordance with § 240.13d-113d-1(b)(1)(ii)(K).

If
filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution.

CUSIP No. 293904108

SCHEDULE 13G

Page 7 of 10

Item 4.

Ownership:

Item
2 is incorporated by reference.

(a)

Each of the Reporting Persons may be deemed to beneficially own 2,252,950 shares of Common Stock.*

(b)

The number of shares each Reporting Person may be deemed to beneficially own constitutes approximately 5.1% of the Common Stock
outstanding, based on 44,214,603 shares of Common Stock outstanding as of October 31, 2017 as reported in the Issuer’s Quarterly
Report on Form 10-Q for the period ended September 30, 2017.

(c)

Number of shares as to which each Reporting Person has:

(i)

Sole power to vote or to direct the vote: 0.

(ii)

Shared power to vote or to direct the vote: 2,252,950.

(iii)

Sole power to dispose or to direct the disposition of:
0.

(iv)

Shared power to dispose or to direct the disposition
of: 2,252,950.

*
PPCP directly owns 2,252,950 shares of Common Stock of the Issuer (the “PPCP Shares”) and each of the
Reporting Persons may be deemed to beneficially own 2,252,950 based on the ownership and control structure set forth in Item
2. PPCM, as the investment advisor of PPCP, may be deemed to have the shared power to vote or direct the vote of (and the
shared power to dispose or direct the disposition of) the PPCP Shares. PPCGP, as the general partner of PPCP, may be deemed
to have the shared power to vote or direct the vote of (and the shared power to dispose or direct the disposition of) the
PPCP Shares. By virtue of Mr. Fakhry’s position as the manager of each of PPCM and PPCGP, Mr. Fakhry may be deemed to
have the shared power to vote or direct the vote of (and the shared power to dispose or direct the disposition of) the PPCP
Shares, and therefore Mr. Fakhry may be deemed to be the beneficial owner of the PPCP Shares. Each of PPCGP, PPCM, and Mr.
Fakhry disclaims beneficial ownership of the PPCP Shares. In addition, the filing of this Schedule 13G shall not be construed
as an admission that any of the reporting persons is the beneficial owner of any securities covered by this Schedule 13G for
any other purposes than Section 13(d) of the Securities Exchange Act of 1934.

Item 5.

Ownership of Five Percent or Less of a Class:

If
this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial
owner of more than 5 percent of the class of securities, check the following ¨.

Item 6.

Ownership of More than Five Percent on Behalf of Another
Person:

Not
applicable.

CUSIP No. 293904108

SCHEDULE 13G

Page 8 of 10

Item 7.

Identification and Classification of the Subsidiary
Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person:

See
Items 2 and 4 above.

Item 8.

Identification and Classification of Members of the
Group:

Not
applicable.

Item 9.

Notice of Dissolution of Group:

Not
applicable.

Item 10.

Certification:

By
signing below, the undersigned certify that, to the best of their knowledge and belief, the securities referred to above were
acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the
effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination
under Section 240.14a-11.

CUSIP No. 293904108

SCHEDULE 13G

Page 9 of 10

SIGNATURE

After reasonable inquiry and to the best
of their knowledge and belief, the undersigned certify that the information set forth in this statement is true, complete and correct.

Dated this 9th day of February, 2018

POPLAR POINT CAPITAL MANAGEMENT LLC

By:

/s/ Jad Fakhry

Jad Fakhry, Manager

POPLAR POINT CAPITAL PARTNERS LP

By:

Poplar Point Capital GP LLC

its General Partner

By:

/s/ Jad Fakhry

Jad Fakhry, Manager

POPLAR POINT CAPITAL GP LLC

By:

/s/ Jad Fakhry

Jad Fakhry, Manager

/s/ Jad Fakhry

JAD FAKHRY, an individual

CUSIP No. 293904108

SCHEDULE 13G

Page 10 of 10

JOINT FILING AGREEMENT

The undersigned hereby agree to jointly
prepare and file with regulatory authorities this Schedule 13G and any future amendments thereto reporting each of the undersigned’s
ownership of securities of the Issuer named herein, and hereby affirm that such Schedule 13G is being filed on behalf of each of
the undersigned pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934. The
undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy
of the information concerning him or it contained therein, but shall not be responsible for the completeness and accuracy of the
information concerning the other, except to the extent that he or it knows or has reason to believe that such information is inaccurate.